1985, The First Kernels of The RPG Research Project
The short version is that I was fortunate enough to be at an extraordinary school, Realms Of Inquiry "A school for Gifted & Talented Children", combined with serendipitous events and my willingness to step into the fray (sometimes with clumsy big boots), that first lead to me writing an 8 page English course paper on current events and I chose RPGs, then I was asked to read that paper to the whole school, and then later my being able to "teach" RPGs to the school for 5 days a week over about a month-long time period.
The much more detailed and longer version is here:
http://rpgresearch.com/about/blog/anecdotal-experiences-of-stigma-as-a-tabletop-role-playing-gamer